Reason: It may be a hardware problem or a system BUG. At this time, you need to first check if there is a hardware problem. Open a program or song with sound. The operation is:

Plug and unplug the headphone cable, and use a cotton swab to stir back and forth in the headphone jack.

2. To charge, shake the charging connector back and forth.

3. Restore settings-General--Restore--Restore all settings.

4. Check whether mute is turned off, press the button on the left side of the phone.

5. If nothing works, the only option is to send it for repair. There is a defect called the volume button sliding down, that is, a button is stuck inside and keeps being pressed

Not many mobile phone stores can repair it. money. Either the buttons or the SPK have a problem.

Anti-fall patent

In the early morning of March 22, 2013, the U.S. Patent and Trademark Office (PTO) disclosed a patent application submitted by Apple on March 21, 2013. , this patent aims to prevent electronic devices such as iPhones from being broken after being dropped.

The name of this patent is "Protective Mechanism for an Electronic Device", which introduces several methods to prevent electronic devices such as iPhones from being broken after being dropped.

One method is that the device's own sensor will detect the height and speed of the phone being dropped, and then adjust the orientation of the phone. In this way, products such as mobile phones can adjust their orientation during the fall so that the drop-resistant location hits the ground first, such as a corner or the back, rather than a fragile location, such as the screen. To achieve this function, the device needs to be equipped with a "protection mechanism", which may require the use of a small tank of compressed gas to change the direction of the body.

Another approach is for the device to be slowed down during a fall, as if equipped with a parachute. To achieve this function, the protection mechanism needs to trigger a propeller-like device that slows the device's fall.

Although Apple only mentioned the iPhone in its patent application, industry insiders said that these technologies are also applicable to other smartphones, tablets, portable music players, digital cameras and other products.